refactor: Refactor fillers; design fork_choice_test; remove genesis tests

- Remove genesis tests for now since we don't have the need yet
- Refactor fillers and add a ``fork_choice_test`` type

Author: fselmo

packages/tests/src/lean_spec_tests/__init__.py

@@ -4,32 +4,42 @@
 
 from .base_types import CamelModel
 from .builders import BlockBuilder
-from .consensus_env import ConsensusEnvironment
-from .filler_api import genesis_test, state_transition_test
-from .spec_fixtures import (
+from .test_fixtures import (
     BaseConsensusFixture,
     ForkChoiceTest,
-    GenesisTest,
     StateTransitionTest,
 )
+from .test_types import (
+    AttestationStep,
+    BaseForkChoiceStep,
+    BlockStep,
+    ForkChoiceStep,
+    StateExpectation,
+    StoreChecks,
+    TickStep,
+)
 
-GenesisTestFiller = Type[GenesisTest]
 StateTransitionTestFiller = Type[StateTransitionTest]
+ForkChoiceTestFiller = Type[ForkChoiceTest]
 
 __all__ = [
     # Public API
-    "genesis_test",
-    "state_transition_test",
-    "ConsensusEnvironment",
     "BlockBuilder",
     # Base types
     "CamelModel",
     # Fixture classes
     "BaseConsensusFixture",
-    "GenesisTest",
     "StateTransitionTest",
     "ForkChoiceTest",
+    # Test types
+    "BaseForkChoiceStep",
+    "TickStep",
+    "BlockStep",
+    "AttestationStep",
+    "ForkChoiceStep",
+    "StateExpectation",
+    "StoreChecks",
     # Type aliases for test function signatures
-    "GenesisTestFiller",
     "StateTransitionTestFiller",
+    "ForkChoiceTestFiller",
 ]

packages/tests/src/lean_spec_tests/builders.py

@@ -73,7 +73,7 @@ def build(
             slot=slot,
             proposer_index=proposer_index,
             parent_root=parent_root,
-            state_root=Bytes32.zero(),  # Will compute this
+            state_root=Bytes32.zero(),
             body=body,
         )
 
@@ -92,7 +92,6 @@ def build(
             body=body,
         )
 
-        # Sign it (placeholder signature for now)
         signed_block = SignedBlock(
             message=final_block,
             signature=Bytes32.zero(),